<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>景文超</title>
    <style>
      .main {
        margin: 0 auto;
        width: 400px;
        height: 200px;
        background-color: skyblue;
        border-radius: 5px;
        box-shadow: 0 0 10px;
      }
    </style>
  </head>
  <body>
    <div class="main">
      <h1>景文超的网页</h1>
    </div>
  </body>
</html>
